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Subject: Re: 3V DC back-up power supply
Date: 22 Oct 2002 14:22:04 -0700
NNTP-Posting-Date: 22 Oct 2002 21:22:04 GMT
Peter Bennett wrote in message news:...
> On 18 Oct 2002 07:48:05 -0700, email@example.com wrote:
> >> Not sure what you mean without more information, but if you want a 3V
> >> coin cell non-rechargeable battery to 'kick in' when the main supply
> >> fails, and the main supply is higher than the battery (like 5V in a
> >> PC?), and current consumption is low (10s of mA), the product you seek
> >> is the 1N914, or 1N4004, or preferably a Schottky diode with low diode
> >> drop.
> >Are these items 1N914 or 1N4004 actual products consisting of
> >supervisory ICs, or are they components that you are recommending me
> >to purchase to build what I am looking for? If they are model numbers
> >for the device, where can I purchase?
> The 1N914 is a very common silicon signal diode - 1N916 or 1N4148 are
> also common diodes that could be used.
> The 1N4004 is a very common silicon rectifier diode - it is one of a
> family of diodes - 1N4001 - 1N4007 - with increasing reverse voltage
> Basically, the other poster is saying that you could use any diodes
> you can get for this job.
Yes, but these diodes will need to be used on a circuit board,
correct? My application calls for a complete product found in the
market that is approved by various standards associations so as to not
void the warranty on the original machine that I am trying to control.
In my original post, I was looking for a device sold in the market
place that was able to provide 3V dc to a clock in order to keep it
alive for a lengthy period of time during a power outtage, and
recharge when building power is up and running. Kind of like how the
memory in BIOS is retained when the computer is off. The device I'm
looking for has to be sold in the market place as a complete unit that
doesn't require any tampering...just some wire leads to be connected
to my clock.
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